3.11.19.4.18. statsmodels.stats.sandwich_covariance.group_sums¶
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statsmodels.stats.sandwich_covariance.group_sums(x, group)[source]¶ sum x for each group, simple bincount version, again
- group : array, integer
- assumed to be consecutive integers
no dtype checking because I want to raise in that case
uses loop over columns of x
#TODO: remove this, already copied to tools/grouputils